The RIO DECLARATION ON ENVIRONMENT AND DEVELOPMENT 1992, Principle 21, states that:

1. Rio Declaration 1992, Principle 2 (often called the 'No Harm Principle' or 'sic utere tuo ut alienum non laedas'): 'States have, in accordance with the Charter of the United Nations and the principles of international law, the sovereign right to exploit their own resources pursuant to their own environmental and developmental policies, and the responsibility to ensure that activities within their jurisdiction or control do not cause damage to the environment of other States or of areas beyond the limits of national jurisdiction.' 2. This principle was also Principle 21 of the Stockholm Declaration 1972 — restating sovereign right + state responsibility duo. 3. Recognised as customary international law in cases like Trail Smelter Arbitration (US v Canada, 1941), Corfu Channel (1949). 4. ICJ in Pulp Mills on the River Uruguay (Argentina v Uruguay), 2010 ICJ Rep 14, confirmed the principle. 5. Hence option B is correct. _Source: EPA 1986 / Constitution of India / Stockholm/Rio/Paris / Indian SC environmental jurisprudence — Rio Declaration 1992, Principle 2 (NOT 21 — the user's question was using common nomenclature)_